Number of achiral colorings of the 8 cubic facets of a tesseract or of the 8 vertices of a hyperoctahedron.

A337958

Number of achiral colorings of the 8 cubic facets of a tesseract or of the 8 vertices of a hyperoctahedron.

Terms

    a(0) =1a(1) =15a(2) =126a(3) =700a(4) =2850a(5) =9261a(6) =25480a(7) =61776a(8) =135675a(9) =275275a(10) =523446a(11) =943020a(12) =1623076a(13) =2686425a(14) =4298400a(15) =6677056a(16) =10104885a(17) =14942151a(18) =21641950a(19) =30767100a(20) =43008966a(21) =59208325a(22) =80378376a(23) =107730000a(24) =142699375a(25) =186978051a(26) =242545590

External references